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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 27, 2013
Dec. 28, 2012
Dec. 30, 2011
Intangible Assets [Line Items]      
Goodwill acquired year to date $ 34.1 [1]    
Amortization of intangible assets 4.9 3.1 2.9
Trade name/trademarks
      
Intangible Assets [Line Items]      
Indefinite-lived trade name/trademarks 5.7 5.7  
MDT Personnel, LLC
      
Intangible Assets [Line Items]      
Goodwill acquired year to date 25.7    
Crowley Transportation Services, LLC
      
Intangible Assets [Line Items]      
Goodwill acquired year to date 0.8    
The Work Connection, Inc.
      
Intangible Assets [Line Items]      
Goodwill acquired year to date $ 7.6    
[1] Goodwill acquired includes $25.7 million, $0.8 million, and $7.6 million due to the acquisitions of MDT, CTS, and TWC, respectively.